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Topic: Light curve

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	Light curve - Wikipedia, the free encyclopedia
		In astronomy, a light curve is a graph of light intensity as a function of time.
		Light curves can be periodic, as in the case of eclipsing binaries, cepheid variables and other variables, or aperiodic, like the light curve of a nova, a cataclysmic variable star or a supernova.
		In planetology, a light curve can be used to estimate the rotation period of a minor planet or moon.
	en.wikipedia.org /wiki/Light_curve (243 words)

	Light curve (Site not responding. Last check: 2007-10-08)
		In astronomy, a light curve is a graph of light intensity as afunction of time.
		Light curves can be periodic, as in the case of eclipsingbinaries, cepheid variables and other variables, or aperiodic, like the light curve of a nova, a cataclysmic variable star or a supernova.
		In planetology, a light curve can be used to estimate the rotation periodof a minor planet or moon.
	www.therfcc.org /light-curve-33370.html (225 words)

	Understanding Binary Stars Via Light Curves (Site not responding. Last check: 2007-10-08)
		The situation is reversed with light curves the observations are typically clean and periodic and there are only relatively minor analogies to the line blending and profile effects of radial velocities or the subjective effects of visual binary observing (which have been eliminated recently by interferometric and speckle methods of observing).
		Furthermore, the velocity curves are observed separately for the two stars, in contrast to the light curve, which is observed only in their blended light.
		The ratio of light lost to light remaining at the bottom of a total eclipse equals the luminosity ratio of the smaller to larger star (in a given observational bandpass).
	binaries.boulder.swri.edu /binaries/papers/rew_iappp_94 (9132 words)

	* Light - (Astronomy): Definition
		Light Curves and What They Can Tell Us light curve is a graph which shows the brightness of an object over a period of time.
		Light often means the portion of the electromagnetic spectrum visible to the human eye, but can also refer to other forms of electromagnetic radiation.
		Light is a disturbance of electric and magnetic fields that travels in the form of a wave.
	en.mimi.hu /astronomy/light.html (2976 words)

	SPA Variable Star Section - Newsletter April 1997
		The 1996 light curve shows that the primary eclipse is now centred on around phase 0.02 (30-35 mins late), suggesting that the discrepancy is increasing.
		The light curve for 1992-96 does hint at a period of around 2 years, but the scatter makes it difficult to be certain.
		Hence a light curve of your own observations might be shifted upwards (or downwards) by several tenths of a magnitude relative to this light curve.
	www.popastro.com /sections/vs/vss1997.htm (1987 words)

	Webvision: Light and Dark Adaptation
		On the other hand, when light of short wavelength is used, the rod-cone break is most prominent as the rods are much more sensitive than the cones to short wavelengths once the rods have dark adapted.
		Light adaptation curve plotted as increment threshold versus background luminance (or a threshold-versus-intensity: tvi curve).
		Light of two different wavelengths are used in this case (580 nm for the test and 500 nm for the background).
	webvision.med.utah.edu /light_dark.html (2369 words)

	Light Curves - Introduction
		In the study of objects which change their brightness over time, such as novae, supernovae, and variable stars, the light curve is a simple but valuable tool to a scientist.
		Astronomers call these plots light curves because it is usually some part of the electromagnetic spectrum that we measure as a function of time and use to help us understand our universe.
		For example, once a light curve has been made for a certain stellar object, it can be compared to standard light curves to help identify the type of object being studied.
	imagine.gsfc.nasa.gov /docs/science/how_l1/light_curves.html (449 words)

	ASTR 306 Observing Project (Site not responding. Last check: 2007-10-08)
		In addition, by comparing DY Peg's light curve to the light curves of the comparison stars, one can see that any deviations in DY Peg's light curve were clearly caused by atmospheric flucuations as the deviations are seen in all four light curves.
		Although the R and V filter light curves appear to have similar periods and phases, the shape of the curves is very different.
		The V light curve in Geyer and Hoffman 1975 and the V light curve in Iriarte 1952 have similar periods and changes in magnitude.
	astrwww.astr.cwru.edu /gallery/astr306/results.html (807 words)

	[No title]
		The early IAU light curve prediction was based on CCD magnitudes and "predicts" a maximum of magnitude 3.7 in late July.
		The light curve of Comet LINEAR is actually brightening faster than C/1995 O1 (Hale-Bopp) did at a similar range of heliocentric distance (it showed n=4.15 from the TA database, see Kidger, Hurst and James, 1997, Earth, Moon and Planets, 78, 169).
		It is evident that the light curve brightened as a third power law law initially and then slowed to an inverse square law in mid-January.
	www.iac.es /galeria/mrk/light_1999s4.html (1135 words)

	XTE SOF ASM Light Curve Generator
		XTE SOF ASM Light Curve Generator gives you an ascii dump of ASM light curve for a specified source extracted from SOF ASM Database.
		During the update ASM light curve generator may not work properly.
		Since ASM Light Curve Generator analyzes more than 30 MB of compressed ASM database, it requires couple of minutes processing time before the results come up to your browser.
	heasarc.gsfc.nasa.gov /docs/xte/SOF/asmlc.html (365 words)

	Tartarus Database at Imperial College Astrophysics
		Energy Band (Full2) - For events files and light curves the Full2 band is sometimes used for the SIS and refers to the 0.6-10 keV band.
		For events files and light curves the Soft band refers to the 0.5-2.0 keV and is available for the SIS only.
		Energy Band (Soft2) - For events files and light curves the Soft2 band is sometimes used for the SIS and refers to the 0.6-2.0 keV band.
	astro.ic.ac.uk /Research/Tartarus/glossary.html (1526 words)

	Light Curve Templete/Observing Form For Visual SNe Observers.
		Observing forms for logging magnitude estimates (form, sncurv.gif) and the templete forms (avcurv.gif, snetem.gif) which are uncluttered versions of the templete are presented, and are intended for use in comparing individual or aquired observations verses the mean SN Type Ia, V magnitude light curve (BL).
		Thusly, the templete light curves (SHL) appear to be "flatter", especially in snetem.gif at maximum light as compared to BL's templete.
		It may be prudent to use the templete's snetemp.gif and/or avcurv.gif to register any corrections (to magnitude) AFTER the data points have been obtained and noted on form and sncurv.gif, thus eliminating a tendency for bias towards the mean light curves which might influence the intended outcome....
	www.sai.msu.su /mirrors/isn/snecurv.htm (693 words)

	Theoretical detection of triple star systems with figure-eight orbits
		In particular, the light curve during the second semi-period is now similar but slightly different to the light curve in the first semi-period (the timing and depths of the minma are no longer identical).
		Some researchers (Zessewitsch, Fresa, McLaughlin), however, noticed variations in the shape of the light curve, with similarities between alternate durations of 14.15 days, and therefore proposed that the period might actually be double that figure, approximately 28.3 days, with 6 minima per period.
		The widths of the light curve minima show that the stars of W Serpentis are very close together (relative to their diameters).
	www32.brinkster.com /snefru/space/figureeight/figureeight.htm (1486 words)

	The photosynthesis 'light response curve'
		A light response curve is an example of a "second-order" graph, since the rate of photosynthesis first must be determined by plotting O
		Different plants (even different leaves on the same plant) show differences in the shape of their light response curves, which reveals characteristics of the underlying photosynthesis processes including the light-dependent and light-independent reactions, the efficiency at which light is utilized by photosynthesis, and even the rate of O
		Any further increase in the amount of light striking the leaf does not cause an increase in the rate of photosynthesis--the amount of light is said to be 'saturating' for the photosynthetic process.
	www.marietta.edu /~spilatrs/biol103/photolab/photosyn.html (865 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		The output may be either an event list or a binned light curve.
		The output light curve may take the form of either an event list or a binned time series.
		The ouput may be either an uninterrupted light curve, or one containing data gaps.
	starchild.gsfc.nasa.gov /ftools/caldb/help/fakelc.txt (947 words)

	A New BVRI Light Curve For The Massive Eclipsing Binary V448 Cygni (Site not responding. Last check: 2007-10-08)
		The first light curve was obtained in 1942 by J. Ashbrook based on his visual measurements.
		They assumed a temperature for the main sequence star of 30,000 K and found the supergiant to be near 20,460 K. They obtained a mass ratio of 1.8022 with the main sequence and supergiant stars having masses of 14.0 and 25.2 solar masses, respectively, at an inclination of 83.2 degrees.
		Preliminary light curve analysis using the Wilson-Devinney code gives an inclination closer to 77.5 degrees, resulting in masses around 14.6 for the main sequence star and 26.4 for the supergiant.
	www.aas.org /publications/baas/v29n5/aas191/abs/S045004.html (393 words)

	Eclipsing Binary Stars (Article)
		The variations in light intensity from eclipsing binary stars is caused by one star passing in front of the other relative to an observer.
		The shape of the light curve for an eclipsing binary star system depends mostly on the relative brightness and size of the two stars as well as their orbital inclination as seen from Earth.
		Figure 3: An example light curve with masses and luminosities expressed in arbitrary units and the star radii expressed in terms of a fraction of the orbit radius of the binary star orbit
	www.physics.sfasu.edu /astro/ebstar/ebstar.html (1064 words)

	AAVSO: Light Curve Generator
		A light curve is a graph of brightness (usually in magnitude) vs. time (usually in Julian Date) of a variable star.
		These light curves are not validated, i.e., have not passed the strict quality control of the AAVSO.
		Thus, the light curves may contain data that fall outside of the average magnitude for a given time and star.
	www.aavso.org /data/lcg (490 words)

	Chandra Education - Cas A Activities & Image
		As we shall see when we examine other sources, light curves (which present the brightness of the source as a function of time) can be very exciting and make the objects look like real "clocks in the sky".
		And indeed, at the time of its explosion, the light curve of Cas A must have been incredibly rich and variable, marking the brightening and subsequent dimming of the central object.
		Notice that although the light curve seems to change, the value of the intensity is always 265 counts/sec, plus or minus 10 counts/sec.
	chandra-ed.harvard.edu /casa/casa_activity4.html (631 words)

	2. The Light Curve
		The GIS light curve is shown in Figure 3.2.
		The flare is accompanied by a slight softening of the light curve, as shown in Figure 3.2.
		The general trend is for the hardness ratio to decrease as the intensity increases, indicating that the X-ray spectrum is luminosity dependent.
	lheawww.gsfc.nasa.gov /users/audley/diss/node86.html (180 words)

	[81.01] Light Curve Comparisons of Normal and Peculiar Type Ia Supernovae (Site not responding. Last check: 2007-10-08)
		Each light curve was stretched in the time axis to match a template {\em B} curve made from a few very well sampled, spectroscopically normal Type Ia's.
		A method of least-squares was used to match the stretched curves to the template curve from slightly before peak to +15 days past maximum.
		Nearly all of the stretched curves of the normal Type Ia SNe have a small average deviation about the template curve, while the peculiars are all significantly brighter outside of the fitted region and have a larger range in average deviations.
	www.aas.org /publications/baas/v32n4/aas197/1139.htm (284 words)

	The Hipparcos Space Astrometry Mission: Educational Resources--light curves (Site not responding. Last check: 2007-10-08)
		The horizontal axis gives the `phase' of the light curve, where the phase runs from 0 (start of the period) to 1 (end of the period), with the phase from 1 to 1.5 repeated for clarity.
		The orange curve marks the variability signature that was fitted to the light curves in the process of determining the periods.
		Click on the light curve icon at the bottom right of the details of each system to start an interactive search for the period of the given star.
	www.rssd.esa.int /SA-general/Projects/Hipparcos/education_lcA.html (1205 words)

	Light curve -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-08)
		Light curve -- Facts, Info, and Encyclopedia article
		In (The branch of physics that studies celestial bodies and the universe as a whole) astronomy, a light curve is a graph of light intensity as a function of time.
		In this case, there is sometimes (Click link for more info and facts about aliasing) aliasing, where it is unclear whether there is one or two light curve peaks per rotation period.
	www.absoluteastronomy.com /encyclopedia/l/li/light_curve.htm (173 words)

	Eclipsing Binary Simiulation (Site not responding. Last check: 2007-10-08)
		It is not possible for astronomers to see the individual stars, but there will be a change in the total light coming from the two stars when they "eclipse" one another.
		The flat bottom light curve because star 2 is completely inside (or behind) star.
		Note that when the F-star is in front of the A-star light from the system is reduced more than when the F-star is behind the A-star.
	instruct1.cit.cornell.edu /courses/astro101/java/eclipse/eclipse.htm (183 words)

	Horseshoe Curve's 150th year to be marked by light show (Site not responding. Last check: 2007-10-08)
		Tonight, the folks at the Horseshoe Curve and Osram Sylvania, as the company is now known, will try to make their lights stay on a bit longer to celebrate the curve's 150th anniversary.
		This is the light show as it appeared last night as a 1/2-mile train rounded the famous Horseshoe Curve during the 150th anniversary of its construction.
		As the moment neared to light the curve, Heiler recalled, the organizers were so strict about it having to be pitch dark that people weren't even allowed to smoke.
	www.post-gazette.com /pg/04186/341009.stm (1420 words)

	Exoplanets
		Exoplanets are very difficult to detect because they don't emit any light of their own and are completely obscured by their extremely bright parent stars - normal telescope observation techniques cannot be used.
		This image shows Gliese 229B which is a Brown Dwarf (a failed star slightly larger than a planet) which illustrates the problem and also demonstrates the power of space based observatories.
		This bending of light causes a 'lensing' effect which magnifies the distant, background objects allowing the light-curves (and planetary transits) of distant systems to be observed.
	www.superwasp.org /exoplanets.htm (960 words)

	stdlc_export
		This program is designed to fit a standard light curve template to a poorly-sampled (gappy) light curve of a variable star.
		It provides a final plot of the light curves in up to 3 magnitudes (e.g., both V and I) [the data points are shifted in phase to correspond with the template's maximum at phase=0] and overplots the adopted template.
		It also provides light curve properties (e.g., intensity-mean V and I mags, V_max, V_min, rise time, epoch of maximum light, etc) derived both from the fitted template and from the original data points (you may chose which affords the best representation of the variable star).
	physics.bgsu.edu /~layden/ASTRO/DATA/EXPORT/stdlc_export.htm (1135 words)

	New Scientist Breaking News - Gravitational lensing spots second exoplanet
		When this happens, the nearer star gravitationally tugs on the light from the background star, bending the light and magnifying it.
		It could be about 15,000 light years away from Earth, making it one of the farthest known planets outside our solar system.
		Telescopes see the wobble as a Doppler shift in the star’s light - light waves are either compressed as the star moves toward Earth or stretched out as the star moves away.
	www.newscientist.com /article.ns?id=dn7422 (500 words)

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